Where to tap aftermaket water temp probe
 

Hi, I have this splitfire water temperature gauge with probe but can't find where to hook it up. I know they recommend to take off the oem sender but I don't want to, and even if I do want it, it wont fit caus my splitifre probe is too big to fit that little hole. It's in a 1999 b18b engine

Neone can help?